Solids ternary halides

Plutonium tribromide [1575246-2], PuBr3, and plutonium triiodide [134554)1 -1/, Pul3, both bright green solids, have no practical applications. Comprehensive reviews of the binary and ternary halides are available (147,154,155). 

A new ternary halide CaAg2H has been obtained as a black, diamagnetic compound either by hydriding CaAg2 alloy or by the solid state reaction between Ag and CaH2 in a H2 atmosphere. ... 

The synthesis of the title compositions has been selected as representative of compounds that can readily be prepared by the flux-reaction technique. In this technique, a halide melt serves both as a flux and as a constituent component of the basic reaction. The procedure has been described in the literature1 and has served for the preparation of a variety of ternary oxides, usually in the form of small, well-defined, single crystals. The halide phosphates and vanadates of strontium represent the apatite and spodiosite structures, both interesting compositions from a biochemical and solid-state point of view. 

The kinetics of the catalytic exchange between potassium chloride and -hexyl bromide in solid-liquid systems has been analyzed by Esikova and Yufit195. They propose that a key intermediate in the process is a ternary complex between the catalyst (tetra- -butylammo-nium bromide, TBAB) and the alkyl halide on the KC1 surface. 

Investigations of the solid-state chemistry of the americium oxides have shown that americium has properties typical of the preceding elements uranium, neptunium, and plutonium as well as properties to be expected of a typical actinide element (preferred stability of the valence state 3-j-). As the production of ternary oxides of trivalent plutonium entails considerable difficulties, it may be justified to speak of a discontinuity in the solid-state chemical behavior in the transition from plutonium to americium. A similar discontinuous change in the solid-state chemical behavior is certainly expected in the transition Am Cm. Americium must be attributed an intermediate position among the neighboring elements which is much more pronounced in the reactions of the oxides than in those of the halides or the behavior in aqueous solution. 

The reactions of rubidium and caesium sulphates with barium halides in the solid state and under anhydrous conditions have been studied. With BaCl2, BaBr2, or Bal2, reaction proceeds in two stages in the absence of air to produce BaS04 and the alkali-metal halide at 828—963 K. Conductivity and thermal measurements showed that the exothermic first stage involved formation of a ternary eutectic, whereas the second stage was endothermic. A combination of... 

The conditions under which tetrahedra form are becoming clearer, although some of the identifications rely on spectra and a doubt must remain. (How different will be the spectra of [MnCl ] , if and when identified, from that of [MnC f ) The structural data (Tables 32-34) show that, of the binary and ternary compounds, few of the chloro species, more of the bromo species, and most of the iodo species have [MnX4p tetrahedra in the solids. This progression needs no further explanation than size of halide (see especially the Cs and Rb species M2MnX4). In melts, however, M2MnCl4 compounds give tetrahedra. Even in aqueous solution, and in other solvents (Section 41.3.7.3), in the presence of an excess of X , such tetrahedra have been detected, and it is assumed that [MnX, solvent]" tetrahedra also are present. Such latter species are yet poorly... 

SOLID AND LIQUID NbClj-MCl-M Cl-MIXTURES For the investigation of NbCls in alkali halide melts low melting eutectic mixtures have been selected due to the corrosivity of NbCls at temperatures above 600 °C. Mixtures of interest are CsCl/NaCl (Tgut=490 °C) and LiCl/KCl (Teut = 375 °C). In these two systems studies of the electrochemical reduction mechanism of Ta(V) and Nb(V) have recently been performed in our group [5,20]. The phase diagrams of these ternary systems are not reported in literature, only the binary mixtures have been measured up to now [21,22,23]. Fig.3 shows the phase diagram of the pseudo binary system NbCls-CsCl/NaCl (eut) up to a concentration of x =0.45 as measured with... 

Silicon, as the heavier homolog of carbon, is fourfold coordinated in its compounds in most cases. This is, for example, reflected by the chemistry of silicates [1]. In these naturally occurring compounds, the silicon atoms are almost exclusively found in Si04-coordination. The situation is similar for synthetic solids, such as extended binary phases like pure silica zeolite-type frameworks [2], SiS2, SiC or Si3N4, and related more complex ternary and multinary solids [3], This is also valid for molecular silicon halides, hydrides, and metal organic (e.g., silicon alkoxides) as well as organometaUic silicon compounds [3, 4],... 

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